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Message-Id: <20171124172411.19476-41-mingo@kernel.org> Date: Fri, 24 Nov 2017 18:24:08 +0100 From: Ingo Molnar <mingo@...nel.org> To: linux-kernel@...r.kernel.org Cc: Dave Hansen <dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...capital.net>, Thomas Gleixner <tglx@...utronix.de>, "H . Peter Anvin" <hpa@...or.com>, Peter Zijlstra <peterz@...radead.org>, Borislav Petkov <bp@...en8.de>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: [PATCH 40/43] x86/mm/kaiser: Add a function to check for KAISER being enabled From: Dave Hansen <dave.hansen@...ux.intel.com> Currently, all of the checks for KAISER are compile-time checks. Runtime checks are needed for turning it on/off at runtime. Add a function to do that. Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com> Signed-off-by: Thomas Gleixner <tglx@...utronix.de> Cc: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Peter Zijlstra <peterz@...radead.org> Cc: daniel.gruss@...k.tugraz.at Cc: hughd@...gle.com Cc: keescook@...gle.com Cc: linux-mm@...ck.org Cc: luto@...nel.org Cc: michael.schwarz@...k.tugraz.at Cc: moritz.lipp@...k.tugraz.at Cc: richard.fellner@...dent.tugraz.at Link: https://lkml.kernel.org/r/20171123003518.B7D81B14@viggo.jf.intel.com Signed-off-by: Ingo Molnar <mingo@...nel.org> --- arch/x86/include/asm/kaiser.h | 5 +++++ include/linux/kaiser.h | 5 +++++ 2 files changed, 10 insertions(+) diff --git a/arch/x86/include/asm/kaiser.h b/arch/x86/include/asm/kaiser.h index 040cb096d29d..35f12a8a7071 100644 --- a/arch/x86/include/asm/kaiser.h +++ b/arch/x86/include/asm/kaiser.h @@ -56,6 +56,11 @@ extern void kaiser_remove_mapping(unsigned long start, unsigned long size); */ extern void kaiser_init(void); +static inline bool kaiser_active(void) +{ + extern int kaiser_enabled; + return kaiser_enabled; +} #endif #endif /* __ASSEMBLY__ */ diff --git a/include/linux/kaiser.h b/include/linux/kaiser.h index 77db4230a0dd..a3d28d00d555 100644 --- a/include/linux/kaiser.h +++ b/include/linux/kaiser.h @@ -28,5 +28,10 @@ static inline int kaiser_add_mapping(unsigned long addr, unsigned long size, static inline void kaiser_add_mapping_cpu_entry(int cpu) { } + +static inline bool kaiser_active(void) +{ + return 0; +} #endif /* !CONFIG_KAISER */ #endif /* _INCLUDE_KAISER_H */ -- 2.14.1
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